Giant Mine (Giant Tungsten prospect; Grand Mountain Mine; Grand Mountain claim; Giant Mine; Giant Nos. 3-10), Baboquivari District, Baboquivari Mts, Pima Co., Arizona, USA
Latitude: 31°43'59"N
Longitude: 111°40'0"W
Ref.: Dale, V.B., Stewart, L.A., and McKinney, W.A. (1960), Tungsten deposits of Cochise, Pima, and Santa Cruz Counties., Arizona, U.S. Bureau of Mines Report of Investigation 5650: 78-81.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 108 (Table 4).
MRDS database Dep. ID file #10009824, MRDS ID #D003057; and, Dep. ID #10039530, MRDS ID #M050227.
A former small surface W-Cu-Ag-Mo mine located in sec. 19 and North-central sec. 30, T.20S., R.7E., and secs. 24 & 25, T20S, R6E (protracted), about 2,000 feet NE of Chuivaya Well. Discovered 1951 by Mr. William H. Coplen. Owned at times, or in part, by Coplen; Shannon Mines, Inc.; and the Cinderra Mining & Engineering Co., Inc.
Mineralization is irrgular, disconnected quartz lenses with spotty scheelite and minor copper oxides in badly faulted Laramide quartzitic beds. Local skarn minerals and narrow aplite dikes. The ore strikes N-S and dips E to W. The quartzite bed is 4-6 feet thick. The scheelite occurs in discontinuous lenses.
The zoisite-bearing quartzite bed averaged 0.30% WO3 & 0.56% Mo03. The Grand Mountain claim averaged 0.19% WO3 & 0.04% Mo03. Ca-Al silicates inhibit magnetic separation of concentrates.
Workings include numerous open cuts and pits. Some 20 tons of low-grade copper-silver ore and about 50 tons of tungsten ore were produced in 1957.
Mineral List
6 entries listed. 6 valid minerals.
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